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Physics
WAEC / WASSCE 2014
Mechanics and Properties of Matter
Solution
Heat transfer by conduction is similar to wave motion because
A
there is increase in temperature
B
transfer of materials is involved
C
charged particles vibrates at right angles
D
no transfer of materials is involved
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Heat transfer by conduction is similar to wave motion because no transfer of materials is involved. In conduction, heat is transferred from molecule to molecule within a substance without moving the substance as a whole. This is similar to wave motion where energy is transferred from particle to particle within the medium without any net movement of the medium itself.
Source: Myschool Past Questions Archive (Record #35752)
Physics
WAEC / WASSCE 2014
Thermal Physics
The temperature at which the water vapor in the air saturates the air and begins to condense is known as
A
dew point
B
critical point
C
boiling point
D
triple point
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #35753)
Physics
WAEC / WASSCE 2014
Heat Energy & Temperature
The change of state from solid to liquid occurs
A
at constant temperature
B
when temperature is lower than the boiling point
C
when temperature is just near freezing point
D
when temperature is equal to the boiling point
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #35754)
Physics
WAEC / WASSCE 2014
Thermal Physics
Which of the following types of thermometers can be used to measure a range of temperature from -50^\circC to 50^\circ? i. Clinical ii. Mercury iii. Alcohol-in-glass
A
i only
B
ii only
C
iii only
D
i and ii only
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #35755)
Physics
WAEC / WASSCE 2014
Heat Energy & Temperature
Diagram
Solution
The diagram above illustrates a uniform metre rule which is balanced on a pivot by some masses. Calculate the value of M
Attached Figure / Diagram
A
500.0g
B
400.0g
C
44.4g
D
25.0g
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
clockwise moment = Anti-clock wise moment
= M x 40 = 100 x 10
M = \(\frac{1000}{40}\)
= 25g
Source: Myschool Past Questions Archive (Record #35746)
Physics
WAEC / WASSCE 2014
Heat Energy & Temperature
Solution
The period of a simple pendulum X is 5s. What is the period of a simple pendulum Y which makes 50 vibrations in the same time it takes X to make 20 vibrations?
A
12.5s
B
2.5s
C
2.0s
D
1.2s
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
It takes X 5s for 1 complete vibration.
⇒ It takes X (5 x 20)s for 20 vibrations.
= 100s.
It takes Y 100s for 50 vibrations.
⇒ The period of Y = \(\frac{100}{50}\)s
= 2s.
Source: Myschool Past Questions Archive (Record #35747)
Physics
WAEC / WASSCE 2014
Mechanics and Properties of Matter
Solution
Alcohol of mass 21g and density 0.7g cm-3 is mixed with 10g of water. Determine the density of the mixture [density of water = 1.0gcm-3]
A
0.775gcm-3
B
0.875gcm-3
C
0.780gcm-3
D
0.880gcm-3
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(V_A = \frac{M}{D} = \frac{21}{0.7} = 30cm^3\)
\(V_w = \frac{M}{D} = \frac{10}{1} = 10cm^3\)
Vmixture = 30 + 10 = 40cm3
Mmixture = 21 + 10 = 31g
Dmixture = \(\frac{m}{v} = \frac{31}{40} = 0.775\)
Source: Myschool Past Questions Archive (Record #35748)
Physics
WAEC / WASSCE 2014
Mechanics and Properties of Matter
A device that converts mechanical energy into electrical energy is
A
a dynamo
B
an electric motor
C
an induction coil
D
a transformer
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #35749)
Physics
WAEC / WASSCE 2014
Mechanics and Properties of Matter
The S.I unit of power is
A
N
B
Pa
C
W
D
J
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #35750)
Physics
WAEC / WASSCE 2014
Heat Energy & Temperature
A body of mass M kg rests on a plane inclined at an angle \(\theta\) to the horizontal. The component of the weight of the body parallel to the plane is
A
Mg sin \(\theta\)
B
Mg cos \(\theta\)
C
Mg tan \(\theta\)
D
Mg sec \(\theta\)
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #35756)
Physics
WAEC / WASSCE 2014
Thermal Physics
Solution
A quantity of water at 20oC is mixed with another quantity of water at 70oC. The final steady temperature of the mixture is 40oC. Determine the ratio of the mass of the cold water to that of the hot water
A
7:2
B
3:2
C
2:5
D
1:2
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Q = MC\(\theta\)
M = \(\frac{Q}{C\theta}\)
\(\frac{Q}{20C}\) : \(\frac{Q}{30C}\)
= 3:2
Source: Myschool Past Questions Archive (Record #35757)
Physics
WAEC / WASSCE 2014
Mechanics and Properties of Matter
Solution
A car traveling at 30ms\(^{-1}\) overcomes a frictional resistance of 100N while moving. Calculate the power developed by the engine. [1 hp = 0.75 kW]
A
0.23hp
B
0.40hp
C
4.00hp
D
4.40hp
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
P = FV = \(\frac{100 \times 30}{1000} = 3 kW\)
\(\frac{3}{0.75} = 4hp\)
Source: Myschool Past Questions Archive (Record #35759)
Physics
WAEC / WASSCE 2014
Heat Energy & Temperature
The quality of a note depends on its
A
frequency
B
pitch
C
overtones
D
amplitude
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #35760)
Physics
WAEC / WASSCE 2014
Heat Energy & Temperature
Solution
A fish inside a pond appears to be at a depth of 1.5m when viewed vertically from above. The refractive index of the water in the pound is 1.3. Calculate the apparent displacement of the fish
A
2.50m
B
1.95m
C
1.50m
D
0.45m
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Real depth = n x apparent depth
= 1.3 x 1.5 = 1.95m
Apparent displacement = 1.95 - 1.5 = 0.45m
Source: Myschool Past Questions Archive (Record #35766)
Physics
WAEC / WASSCE 2014
Waves and Optics
Solution
an observer hears an echo 1.26 seconds after blowing a whistle near a cliff. calculate the distance of the observer from the cliff. [speed of sound in air = 330ms-1]
A
104.4m
B
207.9m
C
415.8m
D
523.8m
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
S = \(\frac{vt}{2} = \frac{330 \times 1.26}{2} = 207.9\)
Source: Myschool Past Questions Archive (Record #35767)